US20160043353A1 - Electric storage device and electric storage apparatus provided with the electric storage device - Google Patents
Electric storage device and electric storage apparatus provided with the electric storage device Download PDFInfo
- Publication number
- US20160043353A1 US20160043353A1 US14/777,460 US201414777460A US2016043353A1 US 20160043353 A1 US20160043353 A1 US 20160043353A1 US 201414777460 A US201414777460 A US 201414777460A US 2016043353 A1 US2016043353 A1 US 2016043353A1
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- Prior art keywords
- insert
- swaged
- conductive member
- electric storage
- rivet
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Links
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
-
- H01M2/02—
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/80—Gaskets; Sealings
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
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- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
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- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
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- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
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- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- FIG. 4 is a sectional view of a main part of the terminal structure before a rivet member and a pulling member are swaged together.
- An electric storage device includes: an electrode assembly including a positive electrode plate and a negative electrode plate that are insulated from each other; a case constituted by a partition wall, the case housing the electrode assembly; a rivet member including an insert part provided on one end, the rivet member being fixed to the partition wall; and a conductive member including an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein the insert part has a higher Vickers hardness than a peripheral region of the insert-receiving part of the conductive member, and the insert part includes, at a distal end of the insert part, a swaged part that is swaged while the insert part is inserted through the conductive member.
- the configuration may be such that the body part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
- the case body 2 and the cover plate 3 are made of metals such as aluminum alloy and stainless steel alloy.
- the case body 2 and the cover plate 3 of this embodiment are made of aluminum alloy.
- the case body 2 has a bottomed rectangular cylindrical shape flattened in the width direction (the horizontal direction in FIG. 1 ) so as to be capable of housing the elongated cylindrical electrode assembly 4 of a wound type.
- the cover plate 3 is a rectangular plate member corresponding to the opening of the case body 2 .
- two through holes 3 a through which rivet members 12 , which will be described below, are inserted are formed in the cover plate 3 at intervals in the longitudinal direction of the cover plate 3 .
- the cover plate 3 is fitted into the opening of the case body 2 , and is fixed to the case body 2 by laser welding or the like while the case body 2 and the cover plate 3 are sealed together.
- the battery cell includes a positive electrode terminal structure 9 and a negative electrode terminal structure 9 .
- each terminal structure 9 includes a resin plate 10 and an outer gasket 11 , a rivet member 12 , a terminal anti-rotation member 13 , a terminal bolt 14 , and a pulling member 15 .
- the resin plate 10 and the outer gasket 11 are arranged so as to sandwich each of the through holes 3 a that are formed on the left and right ends of the cover plate 3 from the inner and outer sides.
- the rivet member 12 is inserted through the through hole 3 a via the resin plate 10 and the outer gasket 11 , and is electrically connected to the connector 8 a of the current collector 8 .
- C1100-H is so-called tough pitch copper.
- the C1100-H is obtained by work hardening of the tough pitch copper (C1100) shown in Table 3 below.
- the mechanical properties of the C1100-H are as shown in Table 4 below.
- the alphabet “P” shown in the column of DESIGNATION of Table 4 after the C1100 is a symbol indicating that a test piece has a plate shape.
- the distal end of the first swaged part 12 b is swaged to be crushed while being inclined outwardly in the radial direction, so as to have a flange shape with a larger diameter than the proximal end of the first swaged part 12 b . That is, the first swaged part 12 b has a larger diameter than the through hole 3 a of the cover plate 3 due to its distal end being swaged.
- the inner diameter of the through hole 3 a of the cover plate 3 , the inner diameter of the through hole 10 b of the resin plate 10 , and the outer diameter of the annular projection 11 d of the outer gasket 11 are equal or substantially equal to each other. Further, the length of the annular projection 11 d of the outer gasket 11 and the total thickness of the cover plate 3 and the resin plate 10 are equal or substantially equal to each other. Further, the inner diameter of the annular projection 11 d of the outer gasket 11 and the inner diameter of the through hole 8 b of the connector 8 a of the current collector 8 are equal or substantially equal to each other.
- the rivet member 12 of this embodiment can reduce the thickness of the rivet member 12 . That is, an increase in thickness of the rivet member 12 is suppressed. Further, the thickness of the pulling member 15 is reduced only in the region in which the pulling member 15 is compressed and deformed by the body part 12 a or the second swaged part 12 c of the rivet member 12 . Therefore, only the thickness of the rivet member 12 as a whole is reduced in the rivet member 12 . Therefore, the cross sectional area of the rivet member 12 that is necessary as a current path can be secured.
- the body part 12 a of the rivet member 12 has a non-circular shape as seen in the center axis direction of the first through hole 15 a of the pulling member 15 .
- the rivet member 12 and the pulling member 15 are integrated together while the peripheral region of the first through hole 15 a of the pulling member 15 is compressed and deformed by the non-circular body part 12 a . Therefore, in the case where an external force is applied to the pulling member 15 , for example, when the rivet member 12 integrated with the pulling member 15 is fixed to a partition wall by swaging the first swaged part 12 b , the motion of the pulling member 15 and the rivet member 12 to relatively rotate about the center axis of the first through hole 15 a is restricted.
- the second swaged part 212 c of the rivet member 212 is inserted through the through hole 213 b of the external terminal 213 , and the distal end of the second swaged part 212 c is swaged, thereby allowing the peripheral region of the through hole 213 b of the external terminal 213 to be sandwiched between the swaged distal end and the body part 212 a .
- This causes the peripheral region of the through hole 213 b of the external terminal 213 to be compressed and deformed from both sides in the thickness direction, so that the thickness of the peripheral region of the through hole 213 b is reduced. As a result, an increase in thickness of the external terminal 213 is suppressed.
- the body parts 12 a , 112 a , 212 a , and 312 a of the rivet members 12 , 112 , 212 , and 312 have a shaft shape.
- the body part of the rivet member is not limited to a specific shape as long as it has a shape that does not allow insertion through the cover plate, the current collector, or the like, through which the first swaged part is inserted.
- the body part of the rivet member for example, may be in the form of a thin plate.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
Provided is an electric storage device and an electric storage apparatus capable of suppressing an increase in thickness of a conductive member due to a rivet member being swaged. The present invention includes a rivet member provided with an insert part, and a conductive member provided with an insert-receiving part through which the insert part is inserted. The insert part has a higher Vickers hardness than the peripheral region of the insert-receiving part.
Description
- This application claims the benefit of Japanese Patent Application No. 2013-65120, which is incorporated herein by reference.
- The present invention relates to an electric storage device including an electrode assembly, a case housing the electrode assembly, a rivet member fixed to a partition wall of the case, and a conductive member electrically connected to the rivet member, and to an electric storage apparatus including the electric storage device.
- In recent years, rechargeable electric storage devices such as battery cells (such as lithium ion battery cells and nickel hydrogen battery cells) and capacitors (such as electric double layer capacitors) are employed as power sources of vehicles (such as automobiles and motorcycles) and various devices (such as mobile terminals and notebook computers). For example, there are various types of battery cells. As one of the types, there is provided a battery cell including an electrode assembly (power generating element), a current collector electrically connected to the electrode assembly, a case (battery case) housing the electrode assembly and the current collector, an external terminal (terminal plate) arranged outside the case, an internal sealing member (gasket) arranged along an inner surface of a partition wall of the case, an external sealing member (gasket) arranged along the outer surface of the partition wall of the case, and a rivet member (terminal) inserted through the partition wall of the case, the internal sealing member, and the external sealing member, wherein the external terminal and the current collector are electrically connected to each other via the rivet member.
- The rivet member is composed of a conductive material. The rivet member includes a body part (body) in the form of a quadrangular prism, a first insert part (upper shaft) in the form of a solid shaft provided continuously to the body part, and a second insert part (lower shaft) in the form of a hollow shaft (cylindrical shape) provided continuously to the body part. The first insert part and the second insert part each have an outer diameter smaller than the outer diameter of the body part. While the first insert part is inserted through the external terminal, the distal end of the first insert part is swaged. The distal end of the second insert part is swaged while the second insert part is inserted through the partition wall of the case, the internal sealing member, the outer sealing member, and the current collector (see
Patent Literature 1, for example). - Thus, the distal end of the first insert part and the distal end of the second insert part of the rivet member each have an expanded diameter. That is, the first insert part in the form of a solid shaft is deformed to have a larger diameter due to its distal end being entirely crushed. On the other hand, the second insert part in the form of a hollow shaft is deformed to have a flange shape due to its distal end being crushed while inclined outwardly in the radial direction. Therefore, the swaged distal ends of the rivet member deform and expand on the conductive members such as the external terminal and the current collector, resulting in an increase in thickness of the external terminal and the current collector. From the viewpoint of the energy density per volume of the electric storage device, it is better for the conductive members to have a smaller apparent thickness.
- Further, this problem applies not only to battery cells but also to capacitors (such as electric double layer capacitors).
- Patent Literature 1: JP H08-077999 A
- It is therefore an object of the present invention to provide an electric storage device capable of suppressing an increase in thickness of conductive members, even if a rivet member is swaged, and an electric storage apparatus including the electric storage device.
- An electric storage device according to the present invention includes: an electrode assembly including a positive electrode plate and a negative electrode plate that are insulated from each other; a case constituted by a partition wall, the case housing the electrode assembly; a rivet member including an insert part provided on one end, the rivet member being fixed to the partition wall; and a conductive member including an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein the insert part has a higher Vickers hardness than a peripheral region of the insert-receiving part of the conductive member, and the insert part includes, at a distal end of the insert part, a swaged part that is swaged while the insert part is inserted through the conductive member.
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FIG. 1 is a side view of a battery cell according to a first embodiment of the present invention. -
FIG. 2 is a sectional view of the battery cell. -
FIG. 3 is an enlarged sectional view of a terminal structure of the battery cell. -
FIG. 4 is a sectional view of a main part of the terminal structure before a rivet member and a pulling member are swaged together. -
FIG. 5A is an enlarged sectional view of the terminal structure for explaining the height of the rivet member after swaging in this embodiment. -
FIG. 5B is an enlarged sectional view of a terminal structure for explaining the height of a rivet member after swaging in a conventional art. -
FIG. 6 is an enlarged sectional view of a terminal structure of a battery cell according to a second embodiment of the present invention. -
FIG. 7 is a side view of a battery cell according to a third embodiment of the present invention. -
FIG. 8 is a sectional view of the battery cell. -
FIG. 9 is an enlarged sectional view of a terminal structure of the battery cell. -
FIG. 10 is a sectional view of a main part of the terminal structure before a rivet member and an external terminal are swaged together. -
FIG. 11 is an enlarged sectional view of a battery module in which such battery cells are connected by bus bars. -
FIG. 12 is an enlarged sectional view of a terminal structure of a battery cell according to a fourth embodiment of the present invention. -
FIG. 13 is an enlarged sectional view of a terminal structure of a battery cell according to another embodiment. -
FIG. 14 is a sectional view of a main part of the terminal structure before a rivet member and a pulling member are swaged together. - An electric storage device according to this embodiment includes: an electrode assembly including a positive electrode plate and a negative electrode plate that are insulated from each other; a case constituted by a partition wall, the case housing the electrode assembly; a rivet member including an insert part provided on one end, the rivet member being fixed to the partition wall; and a conductive member including an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein the insert part has a higher Vickers hardness than a peripheral region of the insert-receiving part of the conductive member, and the insert part includes, at a distal end of the insert part, a swaged part that is swaged while the insert part is inserted through the conductive member.
- According to such a configuration, the insert part of the rivet member is inserted through the insert-receiving part of the conductive member, and its distal end is swaged, thereby expanding on the conductive member. At this time, the insert part has a higher Vickers hardness than the peripheral region of the insert-receiving part of the conductive member, and therefore the distal end of the insert part compresses and deforms the peripheral region of the insert-receiving part in the thickness direction while expanding on the conductive member. This reduces the thickness of the peripheral region of the insert-receiving part, thereby suppressing an increase in thickness of the conductive member.
- According to one aspect, the electric storage device of this embodiment may have a configuration in which the rivet member includes a body part that is joined to the insert part and is in contact with the conductive member, the body part has a larger width dimension in a direction intersecting the insertion direction of the insert part than the insert-receiving part, and the body part has a higher Vickers hardness than a region of the conductive member in contact with the body part.
- According to such a configuration, the distal end of the insert part of the rivet member is swaged, while the insert part is inserted through the insert-receiving part of the conductive member and the body part is in contact with the conductive member, thereby allowing the peripheral region of the insert-receiving part of the conductive member to be sandwiched between the distal end and the body part so as to be compressed and deformed from both sides in the thickness direction. This reduces the thickness of the peripheral region of the insert-receiving part, thereby suppressing an increase in thickness of the conductive member.
- In this case, the configuration may be such that the body part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
- According to such a configuration, in the case where an external force is applied to the conductive member, for example, when the conductive member is fixed to the partition wall, the motion of the conductive member and the rivet member to relatively rotate about the center axis of the insert-receiving part is restricted.
- According to another aspect, the electric storage device of this embodiment may have a configuration in which the insert-receiving part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
- According to such a configuration, when the distal end of the insert part is swaged while the rivet member is supported by any means such as a tool and a jig, the motion of the conductive member to rotate about the center axis due to the swaging action force on the distal end is restricted. Thus, when the distal end of the insert part of the rivet member is swaged, the relative rotation between the rivet member and the conductive member can be suppressed.
- An electric storage device according to another embodiment includes: an electrode assembly including a positive electrode plate and a negative electrode plate that are insulated from each other; a case constituted by a partition wall, the case housing the electrode assembly; a rivet member including an insert part provided on one end and a body part joined to the insert part, the rivet member being fixed to the partition wall; and a conductive member including an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein the body part is wider in a direction intersecting the insertion direction of the insert part than the insert-receiving part and is in contact with the conductive member, the body part has a higher Vickers hardness than a region of the conductive member in contact with the body part, and the insert part includes, at a distal end of the insert part, a swaged part that is swaged while the insert part is inserted through the conductive member.
- According to such a configuration, the distal end of the insert part of the rivet member is swaged, while the insert part is inserted through the insert-receiving part of the conductive member and the body part is in contact with the conductive member, as a result of which the distal end expands on the conductive member. At this time, the body part has a higher Vickers hardness than a region of the conductive member in contact with the body part, and therefore the peripheral region of the insert-receiving part is compressed and deformed in the thickness direction when the conductive member is pressed against the body part by the distal end of the insert part expanding on the conductive member. This reduces the thickness of the peripheral region of the insert-receiving part, thereby suppressing an increase in thickness of the conductive member.
- According to another aspect, the electric storage device of this embodiment may have a configuration in which the body part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
- According to such a configuration, in the case where an external force is applied to the conductive member, for example, when the conductive member is fixed to the partition wall, the motion of the conductive member and the rivet member to relatively rotate about the center axis of the insert-receiving part is restricted.
- An electric storage device according to another embodiment includes: an electrode assembly including a positive electrode plate and a negative electrode plate that are insulated from each other; a case constituted by a partition wall, the case housing the electrode assembly; a rivet member including an insert part provided on one end, the rivet member being fixed to the partition wall; and a conductive member including an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein the insert part has any one of materials C1100-H, C1020-H, and A6061-T6 that are defined in Japanese Industrial Standards, the insert-receiving part of the conductive member has any one of materials A5052-H34, A1050-H24, A1100-O, A1100-H24, and A3003-H, and annealed material C1100-H that are defined in Japanese Industrial Standards, and the insert part includes, at a distal end of the insert part, a swaged part that is swaged while the insert part is inserted through the conductive member.
- According to such a configuration, the insert part of the rivet member is inserted through the insert-receiving part of the conductive member, and its distal end is swaged, thereby expanding on the conductive member. At this time, the material of the insert part is harder than the material of the peripheral region of the insert-receiving part of the conductive member, and therefore the distal end of the insert part compresses and deforms the peripheral region of the insert-receiving part in the thickness direction while expanding on the conductive member. This reduces the thickness of the peripheral region of the insert-receiving part, thereby suppressing an increase in thickness of the conductive member.
- According to one aspect, the electric storage device of the other embodiment may have a configuration in which the rivet member includes a body part having a larger width dimension in a direction intersecting the insertion direction of the insert part than the insert-receiving part, the body part being in contact with the conductive member, and the body part has any one of materials C1100-H, C1020-H, and A6061-T6 that are defined in Japanese Industrial Standards.
- According to such a configuration, the material of the body part is harder than the material of the portion of the conductive member in contact with the body part. Therefore, the distal end of the insert part of the rivet member is swaged, while the insert part is inserted through the insert-receiving part of the conductive member and the body part is in contact with the conductive member, thereby allowing the peripheral region of the insert-receiving part of the conductive member to be sandwiched between the distal end and the body part so as to be compressed and deformed from both sides in the thickness direction. This reduces the thickness of the peripheral region of the insert-receiving part, thereby suppressing an increase in thickness of the conductive member.
- In this case, the configuration may be such that the body part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
- According to such a configuration, in the case where an external force is applied to the conductive member, for example, when the conductive member is fixed to the partition wall, the motion of the conductive member and the rivet member to relatively rotate about the center axis of the insert-receiving part is restricted.
- According to another aspect, the electric storage device of the other embodiment may have a configuration in which the insert part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
- According to such a configuration, when the distal end of the insert part is swaged while the rivet member is supported by any means such as a tool and a jig, the motion of the conductive member to rotate about the center axis due to the swaging action force on the distal end is restricted. Thus, when the distal end of the insert part of the rivet member is swaged, the relative rotation between the rivet member and the conductive member can be suppressed.
- An electric storage device according to still another embodiment includes an electrode assembly including a positive electrode plate and a negative electrode plate that are insulated from each other; a case constituted by a partition wall, the case housing the electrode assembly; a rivet member including an insert part provided on one end, the rivet member being fixed to the partition wall; and a conductive member including an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein the rivet member includes: a body part having a larger width dimension in a direction intersecting the insertion direction of the insert part than the insert-receiving part, the body part being in contact with the conductive member; and a swaged part formed by the distal end of the insert part being swaged while the distal end of the insert part is inserted through the conductive member, the swaged part having a larger width dimension in a direction intersecting the insertion direction of the insert part than the insert-receiving part and sandwiching the conductive member with the body part, the conductive member has a first recess into which at least a part of the swaged part is fitted and a second recess into which a portion of the body part that is in contact with the conductive member is fitted, and the first recess and the second recess are recessed in the insertion direction of the insert part so as to be closer to each other.
- According to such a configuration, the thickness of the peripheral region of the insert-receiving part of the conductive member is reduced as compared to the thickness of the other region by the first recess and the second recess. Therefore, when the rivet member is swaged so that the rivet member and the conductive member are connected, that is, when the conductive member is sandwiched by the swaged part and the body part, at least a part of the swaged part is fitted into the first recess, and the portion of the body part in contact with the conductive member is fitted into the second recess. As a result, an increase in thickness of the conductive member is suppressed.
- An electric storage apparatus according to this embodiment includes: at least two electric storage devices including at least one electric storage device set forth above; and a bus bar coupling the at least two electric storage devices to each other.
- According to such a configuration, in any one of the electric storage devices set forth above, the thickness of the peripheral region of the insert part of the conductive member is smaller than the thickness of the other region of the conductive member, and therefore an increase in thickness of the conductive member, when the rivet member and the conductive member are connected together by swaging the rivet member, is suppressed.
- According to one aspect, the electric storage apparatus of this embodiment may have a configuration in which the bus bar is stacked on the conductive member, and the bus bar has an insertion hole larger than the swaged part in a region overlapping the swaged part.
- As described above, the electric storage device of this embodiment and the electric storage apparatus including the electric storage device can suppress an increase in thickness of the conductive member due to the rivet member being swaged.
- Hereinafter, a battery cell as an embodiment of an electric storage device according to the present invention is described with reference to the drawings. The battery cell according to this embodiment is a non-aqueous electrolyte secondary battery cell, more specifically, a lithium ion secondary battery cell. The battery cell according to this embodiment includes a
case 1 having acase body 2 and acover plate 3 that closes and seals the opening of thecase body 2, as shown inFIG. 1 toFIG. 5B . Further,terminal structures 9 electrically connected to anelectrode assembly 4 housed in thecase 1 are provided on thecover plate 3. - The
case body 2 and thecover plate 3 are made of metals such as aluminum alloy and stainless steel alloy. Thecase body 2 and thecover plate 3 of this embodiment are made of aluminum alloy. Thecase body 2 has a bottomed rectangular cylindrical shape flattened in the width direction (the horizontal direction inFIG. 1 ) so as to be capable of housing the elongatedcylindrical electrode assembly 4 of a wound type. Thecover plate 3 is a rectangular plate member corresponding to the opening of thecase body 2. - As shown in
FIG. 1 andFIG. 2 , two throughholes 3 a through whichrivet members 12, which will be described below, are inserted are formed in thecover plate 3 at intervals in the longitudinal direction of thecover plate 3. Thecover plate 3 is fitted into the opening of thecase body 2, and is fixed to thecase body 2 by laser welding or the like while thecase body 2 and thecover plate 3 are sealed together. - As shown in
FIG. 2 , theelectrode assembly 4 is formed by winding a strip-shapednegative electrode sheet 5 and a strip-shapedpositive electrode sheet 6 that are shifted in different directions on the left and right with a strip-shaped separator 7 interposed between thenegative electrode sheet 5 and thepositive electrode sheet 6 into an elongated cylindrical shape forming a vertically elongated circle about a rotation axis extending in the horizontal direction at the center. Theelectrode assembly 4 is housed within thecase 1 while the whole thereof is covered by an insulating cover formed using an insulating sheet so as to be insulated from thecase 1. Thenegative electrode sheet 5 is formed by allowing a copper foil to carry a negative electrode active material on its surface. Thepositive electrode sheet 6 is formed by allowing an aluminum foil to carry a positive electrode active material on its surface. Thenegative electrode sheet 5 and thepositive electrode sheet 6 have portions without such active material coating on their respective edges in the shifted directions. Therefore, the aluminum foil and the copper foil are exposed on the left and right ends of theelectrode assembly 4, and these electrode metal foils are protruding while they are wound in the form of a wound bundle. - Further,
current collectors 8 are electrically connected respectively to the metal foils protruding on the left and right ends of theelectrode assembly 4. Eachcurrent collector 8 is a metal member that is vertically elongated and is electrically conductive. More specifically, a positive electrodecurrent collector 8 is made of aluminum or aluminum alloy, and a negative electrodecurrent collector 8 is made of copper or copper alloy. The upper part of thecurrent collector 8 is bent in the horizontal direction so as to form aconnector 8 a. The portion of thecurrent collector 8 below theconnector 8 a is bifurcated forward and backward and projects downwardly. This bifurcated portion is sandwiched by clip plates together with an end of theelectrode assembly 4, and is connected and fixed to theelectrode assembly 4 by ultrasonic welding or the like. - The battery cell includes a positive
electrode terminal structure 9 and a negativeelectrode terminal structure 9. As shown in detail inFIG. 3 andFIG. 4 , eachterminal structure 9 includes aresin plate 10 and anouter gasket 11, arivet member 12, aterminal anti-rotation member 13, aterminal bolt 14, and a pullingmember 15. Theresin plate 10 and theouter gasket 11 are arranged so as to sandwich each of the throughholes 3 a that are formed on the left and right ends of thecover plate 3 from the inner and outer sides. Therivet member 12 is inserted through the throughhole 3 a via theresin plate 10 and theouter gasket 11, and is electrically connected to theconnector 8 a of thecurrent collector 8. Theterminal anti-rotation member 13 is arranged adjacent to theouter gasket 11. Theterminal bolt 14 is arranged on the outer surface of thecover plate 3 via theterminal anti-rotation member 13. The pullingmember 15 electrically connects theterminal bolt 14 and therivet member 12 to each other. With such a configuration, theelectrode assembly 4 within thecase 1 and theterminal bolt 14 are electrically connected together. - The
resin plate 10 is a synthetic resin member having insulating properties and sealing properties. More specifically, theresin plate 10 is, for example, made of polyphenylene sulfide (PPS) resin. However, the material of theresin plate 10 is not limited to PPS, and can be appropriately selected. Theresin plate 10 has a rectangular shape. A recess 10 a capable of receiving theconnector 8 a of thecurrent collector 8 is formed on the lower surface of theresin plate 10. Theresin plate 10 has a throughhole 10 b coinciding with a throughhole 8 b formed through theconnector 8 a when theconnector 8 a of thecurrent collector 8 is received in the recess 10 a. - The
outer gasket 11 is a synthetic resin member having insulating properties and sealing properties. More specifically, theouter gasket 11 is, for example, made of polyphenylene sulfide (PPS) resin. However, the material of theouter gasket 11 is not limited to PPS and can be appropriately selected. - The
outer gasket 11 has a rectangular shape with a size larger than abody part 12 a of therivet member 12. In theouter gasket 11, a roundouter wall 11 a is provided on the outer circumferential edge by recessing the upper surface excluding the outer circumferential portion. Theouter gasket 11 includes arecess 11 b capable of receiving thebody part 12 a of therivet member 12 within theouter wall 11 a. Theouter gasket 11 has a throughhole 11 c through which a first swagedpart 12 b of therivet member 12 can be inserted when thebody part 12 a of therivet member 12 is received in therecess 11 b. Anannular projection 11 d inserted through the throughhole 3 a of thecover plate 3 and inserted into the throughhole 10 b of theresin plate 10 is formed on the lower surface of theouter gasket 11. - The
resin plate 10 is arranged on the lower surface (inner surface) of thecover plate 3, as a result of which it is arranged within thecase 1. Theouter gasket 11 is arranged on the upper surface (outer surface) of thecover plate 3, as a result of which it is arranged on the outer surface of thecase 1. On the upper surface of thecover plate 3 in the region where theouter gasket 11 is arranged, anon-circular recess 3 b capable of receiving the lower part (bridge part) of theouter gasket 11 is formed. The lower part (joint surface with the cover plate 3) of theouter gasket 11 is inserted (fitted) into therecess 3 b, thereby restricting the rotation of theouter gasket 11 about the axis of the throughhole 3 a. Therecess 3 b of this embodiment is formed into a rectangular shape corresponding to the shape of the lower part of the rectangularouter gasket 11. Further, therecess 3 b is formed, for example, by coining. - The battery cell has a positive
electrode rivet member 12 and a negativeelectrode rivet member 12. The positiveelectrode rivet member 12 is a conductive metal member made of aluminum alloy (specifically, A5052-H34 defined in JIS: Japanese Industrial Standards) or the like. The negativeelectrode rivet member 12 is a conductive metal member made of copper alloy (specifically, C1100-H defined in JIS) or the like. As shown inFIG. 3 andFIG. 4 , the first swagedpart 12 b is provided protruding downward from the lower surface of thebody part 12 a. A second swagedpart 12 c is provided as an insert part protruding upward from the upper surface of thebody part 12 a. The first swagedpart 12 b and the second swagedpart 12 c both have a shaft-like appearance. The first swagedpart 12 b and the second swagedpart 12 c both have a smaller diameter than thebody part 12 a. - Here, the above-described A5052-H34 is an Al—Mg based aluminum alloy. The A5052-H34 is obtained by stabilizing the aluminum alloy (A5052) shown in Table 1 below after cold working. The mechanical properties of the A5052-H34 are as shown in Table 2 below. The alphabet “P” shown in the column of DESIGNATION of Table 2 after the A5052 is a symbol indicating that a test piece has a plate shape.
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TABLE 1 CHEMICAL COMPOSITIONS ALLOY CLADDING Zr, Zr + Ti, OTHERS No. MATERIAL Si Fe Cu Mn Mg Cr Zn Ca, V Ti INDIVIDUAL TOTAL Al A 5052 — Not Not Not Not 2.2-2.8 0.15-0.35 Not — — Not Not RESIDUAL more more more more more more more than than than than than than than 0.25 0.40 0.10 0.10 0.10 0.05 0.15 UNIT: % -
TABLE 2 MECHANICAL PROPERTIES TENSILE TEST TENSIL YIELD BENDING TEST THICKNESS STRENGTH STRENGTH ELONGATION THICKNESS INSIDE DESIGNATION TEMPER mm N/mm2 N/mm2 % mm RADIUS A 5052P H34 At least 0.2 and At least 3 not more than 0.5 More than 0.5 and At least 4 At least 0.2 and The same as not more than 0.8 not more than 0.8 the thickness More than 0.8 and At least 235 At least 175 At least 4 More than 0.8 and 1.5 times not more than 1.3 not more than 2.9 the thickness More than 1.3 and Not more At least 175 At least 6 More than 2.9 and 2 times not more than 2.9 than 285 not more than 6 the thickness More than 2.9 and At least 175 At least 7 not more than 6.5 More than 6.5 and At least 175 At least 10 not more than 12 - Further, the above-described C1100-H is so-called tough pitch copper. The C1100-H is obtained by work hardening of the tough pitch copper (C1100) shown in Table 3 below. The mechanical properties of the C1100-H are as shown in Table 4 below. The alphabet “P” shown in the column of DESIGNATION of Table 4 after the C1100 is a symbol indicating that a test piece has a plate shape.
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TABLE 3 CHEMICAL COMPOSITIONS ALLOY CHEMICAL COMPOSITION No. Cu Pb Fe Sn Zn Al Mn Ni P OTHERS C 1100 At least 99.90 — — — — — — — — — UNIT: % -
TABLE 4 MECHANICAL PROPERTIES TENSILE TEST BENDING TEST HARDNESS TEST THICK- TENSIL ELON- THICK- THICK- VICKERS ALLOY NESS STRENGTH GATION NESS BENDING INSIDE NESS HARDNESS No. TEMPER DESIGNATION mm N/mm2 % mm ANGLE RADIUS mm HV H C 1100 P-H At least 0.15 At least 275 — Not more 180° 1.5 times At least At least 80 and less than 2 the thick- 0.3 than 0.5 ness At least 0.5 and not more than 10 - The
body part 12 a is in the form of a shaft. Thebody part 12 a has an outer diameter larger than the hole diameter of the throughhole 3 a of thecover plate 3. Thebody part 12 a includes four flat portions (not numbered) that are arranged on its outer circumference at equal intervals in the circumferential direction. The four flat portions each face the inner surface of theouter wall 11 a of theouter gasket 11 when thebody part 12 a is received in therecess 11 b of theouter gasket 11. - The first swaged
part 12 b is a portion that is inserted through the throughhole 3 a of thecover plate 3, the throughhole 8 b of theconnector 8 a of thecurrent collector 8, the throughhole 10 b of theresin plate 10, and the throughhole 11 c of theouter gasket 11. The first swagedpart 12 b is inserted from the outer side to the inner side of thecover plate 3, that is, in a direction from thecover plate 3 toward thecurrent collector 8. In this embodiment, theannular projection 11 d of theouter gasket 11 is inserted through the throughhole 3 a of thecover plate 3 and the throughhole 10 b of theresin plate 10. Therefore, the first swagedpart 12 b is also inserted through the throughhole 3 a of thecover plate 3 and the throughhole 10 b of theresin plate 10 by being inserted through the throughhole 11 c of theouter gasket 11. - The first swaged
part 12 b has a length such that its distal end projects from the inner surface of theresin plate 10 toward the inside of thecase 1 when it is inserted through the throughhole 3 a of thecover plate 3, the throughhole 10 b of theresin plate 10, the throughhole 11 c of theouter gasket 11, and the throughhole 8 b of thecurrent collector 8. - A
non-through hole 12 d extending in the axial direction is formed at the distal end of the first swagedpart 12 b. Thus, the distal end of the first swagedpart 12 b is in the form of a hollow shaft, as shown inFIG. 3 . - The
non-through hole 12 d is formed, for example, using a drill. Therefore, a bottom 12 e of thenon-through hole 12 d is tapered corresponding to the shape of the tip of the drill. - The distal end of the first swaged
part 12 b is swaged to be crushed while being inclined outwardly in the radial direction, so as to have a flange shape with a larger diameter than the proximal end of the first swagedpart 12 b. That is, the first swagedpart 12 b has a larger diameter than the throughhole 3 a of thecover plate 3 due to its distal end being swaged. - As a result, the
body part 12 a and the distal end of the first swagedpart 12 b having a flange shape sandwich the periphery of the throughholes outer gasket 11 to be in tight contact with the outer surface of thecover plate 3 and allowing theresin plate 10 to be in tight contact with the inner surface of thecover plate 3. As a result, the circumference of the throughholes case 1 is kept air tight. The first swagedpart 12 b is swaged before thecover plate 3 is welded to thecase body 2. - As shown in
FIG. 3 andFIG. 4 , the second swagedpart 12 c is in the form of a solid shaft with a smaller diameter than thebody part 12 a. The second swagedpart 12 c has a shaft diameter such that it can be inserted into a first throughhole 15 a, which will be described below, formed in the pullingmember 15. Then, the distal end of the second swagedpart 12 c is swaged while the second swagedpart 12 c is inserted through a first throughhole 15 b of the pullingmember 15. Thus, the pullingmember 15 is sandwiched by thebody part 12 a and the distal end of the second swagedpart 12 c deformed into a flange shape, so as to be physically and electrically connected to therivet member 12. The second swagedpart 12 c is swaged in advance before the first swagedpart 12 b is swaged. - Here, the dimensional relationship of the through
hole 3 a of thecover plate 3, the throughhole 8 b of theconnector 8 a of thecurrent collector 8, the throughhole 10 b of theresin plate 10, the throughhole 11 c of theouter gasket 11, theannular projection 11 d of theouter gasket 11, and the first swagedpart 12 b of therivet member 12 is described. As shown in detail inFIG. 3 , the inner diameter of the throughhole 3 a of thecover plate 3 and the inner diameter of the throughhole 10 b of theresin plate 10 are equal or substantially equal to each other. Further, the inner diameter of the throughhole 3 a of thecover plate 3, the inner diameter of the throughhole 10 b of theresin plate 10, and the outer diameter of theannular projection 11 d of theouter gasket 11 are equal or substantially equal to each other. Further, the length of theannular projection 11 d of theouter gasket 11 and the total thickness of thecover plate 3 and theresin plate 10 are equal or substantially equal to each other. Further, the inner diameter of theannular projection 11 d of theouter gasket 11 and the inner diameter of the throughhole 8 b of theconnector 8 a of thecurrent collector 8 are equal or substantially equal to each other. Further, the inner diameter of theannular projection 11 d of theouter gasket 11, the diameter of the throughhole 8 b of theconnector 8 a of thecurrent collector 8, and the outer diameter of the first swagedpart 12 b of therivet member 12 are equal or substantially equal to each other. - The
body part 12 a of therivet member 12 is inserted into therecess 11 b of theouter gasket 11, thereby allowing the first swagedpart 12 b of therivet member 12 to be inserted through the throughhole 8 b of theconnector 8 a of thecurrent collector 8 passing through the throughhole 11 c at the bottom of therecess 11 b. The distal portion of the first swagedpart 12 b projecting downward from the throughhole 8 b of theconnector 8 a is swaged from below. Thus, therivet member 12 is attached to thecover plate 3 while being electrically connected to theconnector 8 a of thecurrent collector 8 and being insulated from thecover plate 3. - The
terminal bolt 14 serves to electrically connect the battery cell to an external device. Theterminal bolt 14 is a conductive metal member with high strength that is formed using iron, steel such as stainless steel and chromium molybdenum steel, or the like. - A positive
electrode pulling member 15 and a negativeelectrode pulling member 15 are both a conductive metal member having a rectangular shape that is formed using aluminum alloy (specifically, A5052-H34 defined in JIS). The first throughhole 15 a is formed on one end in the longitudinal direction of the pullingmember 15. A second throughhole 15 b is formed on the other end in the longitudinal direction of the pullingmember 15. The second swagedpart 12 c of therivet member 12 is inserted through the first throughhole 15 a in both of the positiveelectrode pulling member 15 and the negativeelectrode pulling member 15. Further, the shaft of theterminal bolt 14 is inserted through the second throughhole 15 b in both of the positiveelectrode pulling member 15 and the negativeelectrode pulling member 15. Furthermore, the distal portion of the second swagedpart 12 c of therivet member 12 projecting upward from the first throughhole 15 a of the pullingmember 15 is swaged from above. This allows therivet member 12 and the pullingmember 15 to be integrated together. - In this embodiment, the second swaged
part 12 c of therivet member 12 serving as an insert part is inserted through the first throughhole 15 a (insert-receiving part) of the pullingmember 15 serving as a conductive member, and the distal end of the second swagedpart 12 c is swaged to expand on the pullingmember 15. The Vickers hardness of the second swagedpart 12 c is higher than the Vickers hardness of the peripheral region of the first throughhole 15 a of the pullingmember 15 that is in contact with thebody part 12 a. Therefore, while the distal end of the second swagedpart 12 c expands on the pullingmember 15, the peripheral region of the first throughhole 15 a is compressed and deformed in the thickness direction. This reduces the thickness of the peripheral region of the first throughhole 15 a, thereby suppressing an increase in thickness of the pullingmember 15. - Further, the second swaged
part 12 c of therivet member 12 is inserted through the first throughhole 15 a of the pullingmember 15, and the distal end of the second swagedpart 12 c is swaged, thereby allowing the peripheral region of the first throughhole 15 a of the pullingmember 15 to be sandwiched by thebody part 12 a and the swaged distal end of the second swagedpart 12 c. Thus, the peripheral region of the first throughhole 15 a of the pullingmember 15 is compressed and deformed from both sides in the thickness direction, and the thickness of the peripheral region of the first throughhole 15 a of the pullingmember 15 is reduced. As a result, an increase in thickness of the pullingmember 15 is suppressed. - Further, the peripheral region of the first through
hole 15 a of the pullingmember 15 is compressed and deformed from both sides in the thickness direction due to the distal end of the second swagedpart 12 c being swaged, as a result of which a recess (first recess) into which a part of the second swagedpart 12 c is fitted and a recess (second recess) into which a part of thebody part 12 a is fitted are formed in the pullingmember 15. The first recess and the second recess are recessed in the insertion direction of the second swagedpart 12 c (insertion part) of therivet member 12 so as to be closer to each other. - Here, the thickness of the
rivet member 12 after swaging is described with reference toFIG. 5A andFIG. 5B . The thickness of therivet member 12 of this embodiment before swaging is the same as the thickness of arivet member 512 of the conventional art before swaging. The thickness of therivet member 12 of this embodiment after swaging is defined as length H1 from the bottom of thebody part 12 a of therivet member 12 to the top of the second swagedpart 12 c. Further, the thickness of therivet member 512 of the conventional art after swaging is defined as length H2 from the bottom of abody part 512 a of therivet member 512 to the top of a secondswaged part 512 c. At this time, the thickness H1 of therivet member 12 of this embodiment is smaller than the thickness H2 of therivet member 512 of the conventional art. Specifically, the thickness H1 of therivet member 12 of this embodiment is smaller than the thickness H2 of therivet member 512 of the conventional art, by the total length (d1+d2) of a thickness d1 with which the pullingmember 15 is compressed and deformed by the second swagedpart 12 c of therivet member 12 and a thickness d2 with which the pullingmember 15 is compressed and deformed by thebody part 12 a. That is, the difference between the thickness H1 of therivet member 12 of this embodiment and the thickness H2 of therivet member 512 of the conventional art is: H2−H1=d1+d2. Therefore, therivet member 12 of this embodiment can reduce the thickness of therivet member 12. That is, an increase in thickness of therivet member 12 is suppressed. Further, the thickness of the pullingmember 15 is reduced only in the region in which the pullingmember 15 is compressed and deformed by thebody part 12 a or the second swagedpart 12 c of therivet member 12. Therefore, only the thickness of therivet member 12 as a whole is reduced in therivet member 12. Therefore, the cross sectional area of therivet member 12 that is necessary as a current path can be secured. - The Vickers hardness can be obtained by measurement based on JIS Z 2244:2009. Specifically, an indenter of quadrangular pyramid made of diamond is pressed against the surface of a test piece to produce an impression, and the surface area of the impression is determined by measuring the diagonal line of the impression. Then, the Vickers hardness can be determined by dividing the force pressing the indenter by the surface area of the impression. In this embodiment, the Vickers hardness of the second swaged
part 12 c, thebody part 12 a, and the peripheral region of the first throughhole 15 a of the pullingmember 15 that is in contact with thebody part 12 a is 110 HV, 110 HV, and 80 HV, respectively. Accordingly, the Vickers hardness of the second swagedpart 12 c is higher than the Vickers hardness of the peripheral region of the first throughhole 15 a that is in contact with thebody part 12 a. Further, the Vickers hardness of thebody part 12 a is higher than the Vickers hardness of the peripheral region of the first throughhole 15 a of the pullingmember 15 that is in contact with thebody part 12 a. - Further, the
body part 12 a of therivet member 12 has a non-circular shape as seen in the center axis direction of the first throughhole 15 a of the pullingmember 15. Therivet member 12 and the pullingmember 15 are integrated together while the peripheral region of the first throughhole 15 a of the pullingmember 15 is compressed and deformed by thenon-circular body part 12 a. Therefore, in the case where an external force is applied to the pullingmember 15, for example, when therivet member 12 integrated with the pullingmember 15 is fixed to a partition wall by swaging the first swagedpart 12 b, the motion of the pullingmember 15 and therivet member 12 to relatively rotate about the center axis of the first throughhole 15 a is restricted. - Next, a battery cell as a second embodiment of the electric storage device according to the present invention is described with reference to the drawings. In the battery cell according to this embodiment, the
rivet member 12 that corresponds to the negative electrode rivet member in the first embodiment has thebody part 12 a and the first swagedpart 12 b. The first swagedpart 12 b is inserted through thecover plate 3 from the inside toward the outside of thecase 1. The distal end of the first swagedpart 12 b located outside thecase 1 is swaged. -
FIG. 6 shows a specific example thereof. Aterminal structure 109 includes arivet member 112 inserted through thecover plate 3 from the inside toward the outside of thecase 1. Therivet member 112 includes abody part 112 a that is electrically connected to theelectrode assembly 4 and aninsert part 112 b that is provided continuously to thebody part 112 a and is inserted through the throughhole 3 a of thecover plate 3. Aresin plate 110 is arranged on the inner surface of thecover plate 3, and anouter gasket 111 is arranged on the outer surface of thecover plate 3. Further, a pullingmember 115 serving as a conductive member is arranged on the outer surface of theouter gasket 111. Theinsert part 112 b of therivet member 112 is inserted through theresin plate 110, thecover plate 3, theouter gasket 111, and a first through hole 115 a of the pullingmember 115 in this order. Then, the distal end of theinsert part 112 b projecting from the pullingmember 115 is swaged. - A negative
electrode rivet member 112 is a conductive metal member formed using copper alloy (specifically, C1100-H defined in JIS). The pullingmember 115 is a conductive metal member having a rectangular shape formed using aluminum alloy (specifically, A5052-H34 defined in JIS). In this embodiment, the Vickers hardness of theinsert part 112 b and the peripheral region of the first through hole 115 a of the pullingmember 115 is 110 HV and 80 HV, respectively. - In this embodiment, the
insert part 112 b of the negativeelectrode rivet member 112 is inserted through the first through hole 115 a of the pullingmember 115. The distal end of theinsert part 112 b is swaged, thereby expanding on the pullingmember 115. However, the Vickers hardness of theinsert part 112 b is higher than the Vickers hardness of the peripheral region of the first through hole 115 a of the pullingmember 115. Therefore, while the distal end of theinsert part 112 b expands on the pullingmember 115, the peripheral region of the first through hole 115 a of the pullingmember 115 is compressed and deformed in the thickness direction, resulting in a reduction in thickness of the peripheral region of the first through hole 115 a. Thus, an increase in thickness of the pullingmember 115 is suppressed. - Next, a battery cell as a third embodiment of the electric storage device according to the present invention is described with reference to the drawings. In the above-described embodiments, examples of screwing-type terminal structures in which an external device and the battery cell are electrically connected to each other by securing a crimping terminal of a lead wire of the external device to a terminal bolt have been described. The battery cell according to this embodiment has a
terminal structure 209 that is a welding-type terminal structure in which the battery cell is connected to another battery cell by welding a bus bar 214 (seeFIG. 11 ) to anexternal terminal 213. - The battery cell of this embodiment includes a positive
electrode terminal structure 209 and a negativeelectrode terminal structure 209. As shown inFIG. 7 toFIG. 9 , eachterminal structure 209 includes theresin plate 10 and an outer gasket (gasket) 211, arivet member 212, and anexternal terminal 213. Theresin plate 10 and theouter gasket 211 are arranged so as to sandwich the corresponding one of the throughholes 3 a that are formed respectively on the left and right ends of acover plate 203 from the inside and outside. Therivet member 212 is inserted through the throughhole 3 a via theresin plate 10 and theouter gasket 211, and is electrically connected to theconnector 8 a of thecurrent collector 8 within thecase 1. Theexternal terminal 213 is arranged on the outer surface of thecover plate 203, and is electrically connected to therivet member 212. These allow theelectrode assembly 4 and theexternal terminal 213 within thecase 1 to be electrically connected to each other. Theexternal terminal 213 corresponds to the conductive member. - The
resin plate 10 is a synthetic resin member having insulating properties and sealing properties. More specifically, theresin plate 10 is, for example, made of polyphenylene sulfide (PPS) resin. However, the material of theresin plate 10 is not limited to PPS, and can be appropriately selected. Theresin plate 10 has a rectangular shape. A recess 10 a capable of receiving theconnector 8 a of thecurrent collector 8 is formed on the lower surface of theresin plate 10. Theresin plate 10 has the throughhole 10 b. The throughhole 10 b coincides (overlaps) with the throughhole 8 b formed in theconnector 8 a when theconnector 8 a of thecurrent collector 8 is received in the recess 10 a. - The
outer gasket 211 is a synthetic resin member having insulating properties and sealing properties. More specifically, theouter gasket 211 is, for example, made of polyphenylene sulfide (PPS) resin. However, the material of theouter gasket 211 is not limited to PPS and can be appropriately selected. - The
outer gasket 211 has a rectangular shape with a size larger than theexternal terminal 213. In theouter gasket 211, a roundouter wall 211 a is formed on the outer circumferential edge by recessing the upper surface excluding the outer circumferential portion. Theouter gasket 211 includes arecess 211 b capable of receiving abody part 212 a of therivet member 212 within theouter wall 211 a. Theouter gasket 211 has a throughhole 211 c through which a first swagedpart 212 b of therivet member 212 can be inserted when thebody part 212 a of therivet member 212 is received in therecess 211 b. Anannular projection 211 d that is inserted through the throughhole 3 a of thecover plate 203 and is inserted into the throughhole 10 b of theresin plate 10 is formed on the lower surface of theouter gasket 211. - The
resin plate 10 is arranged on the lower surface (inner surface) of thecover plate 203, as a result of which it is arranged within thecase 1. Theouter gasket 211 is arranged on the upper surface (outer surface) of thecover plate 203, as a result of which it is arranged on the outer surface of thecase 1. On the upper surface of thecover plate 203 in the region where theouter gasket 211 is arranged, anon-circular recess 203 b capable of receiving the lower part (bridge part) of theouter gasket 211 is formed. The lower part (joint surface with the cover plate 203) of theouter gasket 211 is inserted (fitted) into therecess 203 b, thereby restricting the rotation of theouter gasket 211 about the axis. In this embodiment, therecess 203 b is formed to have a rectangular shape corresponding to the shape of the lower part of the rectangularouter gasket 211. Further, therecess 203 b is formed, for example, by coining. - As shown in
FIG. 7 andFIG. 8 , the battery cell includes a positiveelectrode rivet member 212 and a negativeelectrode rivet member 212. The positiveelectrode rivet member 212 is a conductive metal member formed using aluminum or aluminum alloy (specifically, A5052-H34 defined by JIS). The negativeelectrode rivet member 212 is a conductive metal member formed using copper or copper alloy (specifically, C1100-H defined by JIS). As shown inFIG. 8 andFIG. 9 , therivet member 212 includes thebody part 212 a that is in contact with theexternal terminal 213 and has a larger width than a throughhole 213 b, which will be described below, provided in theexternal terminal 213. Thebody part 212 a has a non-circular shape as seen in the center axis direction of the throughhole 213 b. The firstswaged part 212 b is provided protruding downward from the lower surface of thebody part 212 a. A second swagedpart 212 c is provided as an insert part protruding upward from the upper surface of thebody part 212 a. The firstswaged part 212 b and the second swagedpart 212 c both have a shaft-like appearance with a smaller diameter than thebody part 212 a. - The
body part 212 a is in the form of a shaft. Thebody part 212 a has an outer diameter larger than the hole diameter of the throughhole 3 a of thecover plate 203. Thebody part 212 a includes four flat portions that are arranged on its outer circumference at equal intervals in the circumferential direction. The four flat portions each have a surface facing the inner surface of theouter wall 211 a of theouter gasket 211 surface to surface when thebody part 212 a is received in therecess 211 b of theouter gasket 211. - The first
swaged part 212 b is a portion that is inserted through the throughhole 3 a of thecover plate 203, the throughhole 8 b of theconnector 8 a of thecurrent collector 8, the throughhole 10 b of theresin plate 10, and the throughhole 211 c of theouter gasket 211. The firstswaged part 212 b is inserted from the outer side to the inner side of thecover plate 203, that is, in a direction from thecover plate 203 toward thecurrent collector 8. In this embodiment, theannular projection 211 d of theouter gasket 211 is inserted through the throughhole 3 a of thecover plate 203 and the throughhole 10 b of theresin plate 10. Therefore, the first swagedpart 212 b is also inserted through the throughhole 3 a of thecover plate 203 and the throughhole 10 b of theresin plate 10 by being inserted through the throughhole 211 c of theouter gasket 211. - The first
swaged part 212 b has a length such that its distal end projects from the inner surface of theresin plate 10 toward the inside of thecase 1 when it is inserted through the throughhole 3 a of thecover plate 203, the throughhole 10 b of theresin plate 10, the throughhole 211 c of theouter gasket 211, and the throughhole 8 b of thecurrent collector 8. - A
non-through hole 212 d extending in the axial direction of the first swagedpart 212 b is formed at the distal end of the first swagedpart 212 b. Thus, the distal end of the first swagedpart 212 b is in the form of a hollow shaft, as shown inFIG. 9 . - The
non-through hole 212 d is formed, for example, using a drill. Therefore, a bottom 212 e of thenon-through hole 212 d is tapered corresponding to the shape of the tip of the drill. - The distal end of the first swaged
part 212 b is swaged to be crushed while being inclined outwardly in the radial direction, and thus has a flange shape with a larger diameter than the proximal end (portion in the vicinity of thebody part 212 a) of the first swagedpart 212 b. That is, the distal end of the first swagedpart 212 b is swaged, thereby having a larger diameter than the throughhole 3 a of thecover plate 203. - As a result, the
body part 212 a and the distal end of the first swagedpart 212 b having a flange shape sandwich the periphery of the throughholes outer gasket 211 to be in tight contact with the outer surface of thecover plate 203 and allowing theresin plate 10 to be in tight contact with the inner surface of thecover plate 203. Thus, the circumference of the throughholes case 1 is kept air tight. The firstswaged part 212 b is swaged at a stage before thecover plate 203 is welded to thecase body 2. - As shown in
FIG. 8 toFIG. 10 , the second swagedpart 212 c is in the form of a solid shaft with a smaller diameter than thebody part 212 a. The secondswaged part 212 c has a shaft diameter such that it can be inserted into the throughhole 213 b. Then, the distal end of the second swagedpart 212 c is swaged while the second swagedpart 212 c is inserted through the throughhole 213 b of theexternal terminal 213. Thus, theexternal terminal 213 is sandwiched by thebody part 212 a and the distal end of the second swagedpart 212 c deformed into a flange shape, and is compressed in the thickness direction between the upper surface (surface facing the second swagedpart 212 c) of thebody part 212 a and the distal end of the second swagedpart 212 c deformed into a flange shape, so as to be physically and electrically connected to therivet member 212. The secondswaged part 212 c of this embodiment is swaged in advance before the first swagedpart 212 b is swaged. - Here, the dimensional relationship of the through
hole 3 a of thecover plate 203, the throughhole 8 b of theconnector 8 a of thecurrent collector 8, the throughhole 10 b of theresin plate 10, the throughhole 211 c and theannular projection 211 d of theouter gasket 211, and the first swagedpart 212 b of therivet member 212 is described. As shown in detail inFIG. 9 , the inner diameter of the throughhole 3 a of thecover plate 203 and the inner diameter of the throughhole 10 b of theresin plate 10 are equal or substantially equal to each other. Further, the inner diameter of the throughhole 3 a of thecover plate 203, the inner diameter of the throughhole 10 b of theresin plate 10, and the outer diameter of theannular projection 211 d of theouter gasket 211 are equal or substantially equal to each other. Further, the length of theannular projection 211 d of theouter gasket 211 and the total thickness of thecover plate 203 and theresin plate 10 are equal or substantially equal to each other. Further, the inner diameter of theannular projection 211 d of theouter gasket 211 and the inner diameter of the throughhole 8 b of theconnector 8 a of thecurrent collector 8 are equal or substantially equal to each other. Further, the inner diameter of theannular projection 211 d of theouter gasket 211, the diameter of the throughhole 8 b of theconnector 8 a of thecurrent collector 8, and the outer diameter of the first swagedpart 212 b of therivet member 212 are equal or substantially equal to each other. - The
body part 212 a of therivet member 212 is inserted into therecess 211 b of theouter gasket 211, thereby allowing the first swagedpart 212 b of therivet member 212 to be inserted through the throughhole 8 b of theconnector 8 a of thecurrent collector 8 passing through the throughhole 211 c at the bottom of therecess 211 b. The distal portion of the first swagedpart 212 b projecting downward from the throughhole 8 b of theconnector 8 a is swaged from below. Thus, therivet member 212 is attached to thecover plate 203 while being electrically connected to theconnector 8 a of thecurrent collector 8 and being insulated from thecover plate 203. - The
external terminal 213 is a portion for electrical connection between the battery cell and an external device. Theexternal terminal 213 of this embodiment has a rectangular plate shape wider than the upper surface of the second swagedpart 212 c of therivet member 212. Theexternal terminal 213 is made of aluminum alloy (specifically, A5052-H34 defined in JIS). In this embodiment, the Vickers hardness of the second swagedpart 212 c of therivet member 212 and the peripheral region of the throughhole 213 b of theexternal terminal 213 is 110 HV and 80 HV, respectively. That is, the Vickers hardness of the negative electrodeexternal terminal 213 is lower than the Vickers hardness of therivet member 212. - When a plurality of battery cells are electrically connected to an external device, an electric storage apparatus (battery module) is formed by connecting
conductor connection parts 213 a ofexternal terminals 213 of adjacent battery cells to each other bybus bars 214, as shown inFIG. 11 . Thebus bar 214 includes aconductive coupling member 214 a andinsertion holes 214 b provided on both ends of thecoupling member 214 a. Among external terminals of a pair of battery cells to be connected, thecoupling member 214 a connects a positive electrodeexternal terminal 213 of one battery cell to the negative electrodeexternal terminal 213 of the other battery cell. The insertion holes 214 b are provided at a position corresponding to the negative electrodeexternal terminal 213 in thecoupling member 214 a and at a position corresponding to the positive electrodeexternal terminal 213 in thecoupling member 214 a. The insertion holes 214 b are holes with a size larger than the distal end of the negative electrode second swagedpart 212 c that is deformed into a flange shape by swaging the negative electrode second swagedpart 212 c. Further, the insertion holes 214 b are holes with a size larger than the distal end of the positive electrode second swagedpart 212 c that is deformed into a flange shape by swaging the positive electrode second swagedpart 212 c. The insertion holes 214 b of this embodiment have a circular shape. - When the
bus bar 214 is connected to eachexternal terminal 213, the distal end of theexternal terminal 213 deformed on aconductor connection part 213 a into a flange shape is inserted through the corresponding one of the insertion holes 214 b of thebus bar 214, and theconductor connection part 213 a and thecoupling member 214 a are welded together by laser welding or the like. Thus, the negative electrodeexternal terminal 213 and the positive electrodeexternal terminal 213 are electrically connected to thebus bar 214. - In this embodiment, the second swaged
part 212 c of the negativeelectrode rivet member 212 serving as an insert part is inserted through the throughhole 213 b (insert-receiving part) of theexternal terminal 213 serving as a conductive member. Then, the distal end of the second swagedpart 212 c is swaged, thereby expanding on theconductor connection part 213 a of theexternal terminal 213. However, at least the second swagedpart 212 c has a higher Vickers hardness than the peripheral region of the throughhole 213 b of theexternal terminal 213 that is in contact with thebody part 212 a, and therefore the peripheral region of the throughhole 213 b of theexternal terminal 213 is compressed and deformed in the thickness direction while the distal end of the second swagedpart 212 c expands on theconductor connection part 213 a. This reduces the thickness of the peripheral region of the throughhole 213 b in theexternal terminal 213, thereby suppressing an increase in thickness of theexternal terminal 213. - Further, the second swaged
part 212 c of therivet member 212 is inserted through the throughhole 213 b of theexternal terminal 213, and the distal end of the second swagedpart 212 c is swaged, thereby allowing the peripheral region of the throughhole 213 b of theexternal terminal 213 to be sandwiched between the swaged distal end and thebody part 212 a. This causes the peripheral region of the throughhole 213 b of theexternal terminal 213 to be compressed and deformed from both sides in the thickness direction, so that the thickness of the peripheral region of the throughhole 213 b is reduced. As a result, an increase in thickness of theexternal terminal 213 is suppressed. - Further, the
body part 212 a of therivet member 212 has a non-circular shape as seen in the center axis direction of the throughhole 213 b of theexternal terminal 213. Therivet member 212 and theexternal terminal 213 are integrated together while the peripheral region of the throughhole 213 b of theexternal terminal 213 is compressed and deformed by thenon-circular body part 212 a. Therefore, in the case where an external force is applied to theexternal terminal 213, for example, when therivet member 212 integrated with theexternal terminal 213 is fixed to a partition wall by swaging the first swagedpart 212 b, the motion of theexternal terminal 213 and therivet member 212 to relatively rotate about the center axis of the through hole 231 b is restricted. - In the above-described embodiment, an example in which the second swaged
part 212 c of therivet member 212, which serves as an insert part, is inserted through the throughhole 213 b, which serves as an insert-receiving part, of theexternal terminal 213, which serves as a conductive member, and the distal end of the second swagedpart 212 c is swaged, thereby allowing therivet member 212 and theexternal terminal 213 to be electrically connected to each other is described. However, the conductive member may be thecurrent collector 8, and the insert-receiving part may be the throughhole 8 b. -
FIG. 12 shows a specific example thereof. Arivet member 312 of such a positiveelectrode terminal structure 309 is a conductive metal member formed using copper alloy (specifically, C1100-H defined in JIS). Therivet member 312 includes abody part 312 a that has a larger width than the throughhole 8 b of thecurrent collector 8 and is in contact with thecurrent collector 8, and a first swagedpart 312 b that is provided as an insert part protruding downward from the lower surface of thebody part 312 a. The positive electrodecurrent collector 8 is a conductive metal member formed using aluminum alloy (specifically, A5052-H34 defined in JIS). In this embodiment, the Vickers hardness of the first swagedpart 312 b of therivet member 312 and the peripheral region of the throughhole 8 b of thecurrent collector 8 is 110 HV and 80 HV, respectively. That is, the Vickers hardness of the first swagedpart 312 b of therivet member 312 is higher than the Vickers hardness of the peripheral region of the throughhole 8 b of the positive electrodecurrent collector 8. - In this embodiment, the first swaged
part 312 b of therivet member 312 serving as an insert part is inserted through the throughhole 8 b (insert-receiving part) of theconnector 8 a of thecurrent collector 8 serving as a conductive member, and the distal end of the first swagedpart 312 b is swaged, thereby expanding on theconnector 8 a. However, at least the first swagedpart 312 b has a higher Vickers hardness than the peripheral region of the throughhole 8 b of theconnector 8 a, and therefore the peripheral region of the throughhole 8 b of theconnector 8 a is compressed and deformed in the thickness direction, with the distal end of the first swagedpart 312 b expanding on theconnector 8 a. This reduces the thickness of the peripheral region of the throughhole 8 b, thereby suppressing an increase in thickness of theconnector 8 a. - The electric storage device according to the present invention is not limited to the aforementioned embodiments, and various modifications can be made without departing from the gist of the present invention.
- In the above-described embodiments, the
body parts rivet members - Further, in the above-described embodiments, examples in which the
body parts rivet members parts insert part 112 b, and the first swagedpart 312 b) are described. However, the rivet member may be configured so that the body part and the insert part of the rivet member are independently formed, and the body part and the insert part are connected to each other by welding. - Further, in the above-described embodiments, examples in which the insert-receiving parts (the first through
holes 15 a and 115 a, the throughhole 213 b, and the throughhole 8 b) of the conductive members (the pullingmembers external terminal 213, and theconnector 8 a of the current collector 8) are holes with their openings having substantially the same shape in the thickness direction are described. However, there is no limitation to this. For example, as shown inFIG. 13 andFIG. 14 , a first throughhole 415 a of a pullingmember 415 may include, in the thickness direction, afirst insert part 415 b formed having the same cross sectional shape as the shape of the second swagedpart 12 c of therivet member 12, and asecond insert part 415 c having a diameter increasing from the first throughhole 415 b into a tapered shape. - Further, in the above-described embodiments, examples in which the positive electrode
current collector 8 and the positiveelectrode rivet members current collector 8 and the negativeelectrode rivet members member 15, theexternal terminal 213 of the welding-type terminal structure 209, and thecurrent collector 8, which serve as conductive members, are exemplified. However, the materials of the pullingmember 15, theexternal terminal 213, and thecurrent collector 8 also can be arbitrarily selected as long as the Vickers hardness of the rivet member is higher than the Vickers hardness of the conductive member. - That is, at least the insert part of the rivet member needs only to have a higher Vickers hardness than at least the peripheral region of the insert-receiving part of the conductive member. For example, the configuration may be such that the body part of the rivet member and the insert part are processed differently to be formed having a different Vickers hardness, and the peripheral region of the insert-receiving part of the conductive member and the other region are processed differently to be formed having a different Vickers hardness, thereby allowing the insert part of the rivet member to have a higher Vickers hardness than the peripheral region of the insert-receiving part of the conductive member.
- Further, in the above-described embodiments, A5052-H34 defined in JIS is mentioned as an example of the material of aluminum alloy, and C1100-H defined in JIS is mentioned as an example of the material of copper alloy. However, other materials may be used as the aluminum alloy and the copper alloy as long as the Vickers hardness of the rivet member is higher than the Vickers hardness of the conductive member. For example, in the case where the material of the rivet member is C1100-H defined in JIS, the Vickers hardness of the peripheral region of the insert-receiving part of the conductive member needs only to be lower than the Vickers hardness of C1100-H defined in JIS. In this case, C1100-H defined in JIS subjected to annealing, for example, may be selected as the material of the conductive member, other than aluminum or aluminum alloy such as A1050-H24, A1100-O, A1100-H24, and A3003-H defined in JIS. Further, in the case where the material of the conductive member is A5052-H34 defined in JIS, the insert part of the rivet member needs only to have a higher Vickers hardness than A5052-H34 defined in JIS. In this case, A6061-T6 defined in JIS, for example, may be selected as the material of the rivet member, other than copper alloy such as C1020-H defined in JIS.
- Here, the aforementioned A1050-H24, A1100-O, and A1100-H24 are pure aluminum. The A1050-H24 is obtained by work hardening the aluminum (A1050) shown in Table 5 below to a predetermined value or higher and thereafter reducing its strength by appropriate heat treatment (softening heat treatment) to a predetermined strength. The mechanical properties of the A1050-H24 are as shown in Table 6 below. The A1100-O is obtained by annealing the aluminum (A1100) shown in Table 5 below to the softest state, which is completely recrystallized. The mechanical properties of the A1100-O are as shown in Table 6 below. The A1100-H24 is obtained by work hardening the aluminum (A1100) shown in Table 5 below to a predetermined value or higher and thereafter reducing its strength by appropriate heat treatment (softening heat treatment) to a predetermined strength. The mechanical properties of the A1100-H24 are as shown in Table 6 below. Further, the A3003-H is Al—Mn based aluminum alloy. The A3003-H is obtained by work hardening the aluminum alloy (A3003) shown in Table 5 below. The mechanical properties of the A3003-H (A3003-H112, H12, H22, H14, H24, H16, H26, and H18) are as shown in Table 6 below. Further, the A6061-T6 is Al—Mg—Si based aluminum alloy. The A6061-T6 is obtained by quenching the aluminum alloy (A6061) shown in Table 5 below and thereafter tempering it. The mechanical properties of the A6061-T6 are as shown in Table 6 below. The alphabet “P” shown in the column of DESIGNATION of Table 6 after each of the A1050, A1100, A3003, and A6061 is a symbol indicating that a test piece has a plate shape.
-
TABLE 5 CHEMICAL COMPOSITIONS CLAD- DING Zr, OTHERS ALLOY MATE- Zr + Ti, INDI- No. RIAL Si Fe Cu Mn Mg Cr Zn Ca, V Ti VIDUAL TOTAL Al A 1050 — Not more Not more Not more Not more Not — Not more Not Not Not more — Not more than 0.25 than 0.40 than 0.05 than 0.05 more than 0.05 more more than 0.03 than 99.50 than than than 0.05 0.05 0.03 A 1100 — Si + Fe Not 0.05-0.20 Not more — — Not more — — Not more Not more Not more more than 0.95 than 0.05 than 0.10 than 0.05 than 0.15 than 99.00 A 3003 — Not more Not more 0.05-0.20 1.0-1.5 — — Not more — — Not more Not more RESID- than 0.6 than 0.7 than 0.10 than 0.05 than 0.15 UAL A 6061 — 0.48-0.8 Not more 0.15-0.40 Not more 0.8-1.2 0.04- Not more — Not Not more Not more RESID- than 0.7 than 0.15 0.35 than 0.25 more than 0.05 than 0.15 UAL than 0.15 UNIT: % -
TABLE 6 MECHANICAL PROPERTIES TENSILE TEST TENSIL YIELD BENDING TEST THICKNESS STRENGTH STRENGTH ELONGATION THICKNESS INSIDE DESIGNATION TEMPER mm N/mm2 N/mm2 % mm RADIUS A 1050P H24 At least 0.2 and not — At least 1 more than 0.3 More than 0.3 and — At least 2 not more than 0.5 More than 0.5 and At least 95 — At least 3 At least 0.2 and 0.5 times not more than 0.8 not more than 0.8 the thickness More than 0.8 and Not more At least 75 At least 4 More than 0.8 and The same as not more than 1.3 than 125 not more than 6 the thickness More than 1.3 and At least 75 At least 5 not more than 2.9 More than 2.9 and At least 75 At least 6 not more than 12 A 1100P 0 At least 0.2 and not — At least 15 more than 0.5 More than 0.5 and — At least 20 not more than 0.8 More than 0.8 and At least 75 At least 25 At least 25 At least 0.2 and Adhered not more than 1.3 not more than 6 More than 1.3 and Not more At least 25 At least 30 not more than 6.5 than 110 More than 6.5 and At least 25 At least 28 not more than 75 H14 At least 0.2 and not — At least 1 H24 more than 0.3 More than 0.3 and — At least 2 not more than 0.5 More than 0.5 and At least 120 — At least 3 At least 0.2 and The same as not more than 0.8 not more than 6 the thickness More than 0.8 and Not more At least 95 At least 4 not more than 1.3 than 145 More than 1.3 and At least 95 At least 5 not more than 2.9 More than 2.9 and At least 95 At least 6 not more than 12 -
MECHANICAL PROPERTIES TENSILE TEST TENSIL YIELD BENDING TEST THICKNESS STRENGTH STRENGTH ELONGATION THICKNESS INSIDE DESIGNATION TEMPER mm N/mm2 N/mm2 % mm RADIUS A 3003P H112 At least 4 and not At least 120 At least 70 At least 8 more than 13 More than 13 and not At least 110 At least 40 At least 12 — — more than 50 More than 50 and not At least 100 At least 40 At least 18 more than 75 H12 At least 0.2 and not — At least 2 H22 more than 0.3 More than 0.3 and — At least 3 not more than 0.5 More than 0.5 and — At least 4 not more than 0.8 More than 0.8 and At least 120 At least 85 At least 5 At least 0.2 and 0.5 times not more than 1.3 not more than 6 the thickness More than 1.3 and Not more than At least 85 At least 6 not more than 2.9 155 More than 2.9 and At least 85 At least 7 not more than 4 More than 4 and not At least 85 At least 8 more than 6.5 More than 6.5 and At least 85 At least 9 not more than 12 H14 At least 0.2 and not — At least 1 H24 more than 0.3 More than 0.3 and — At least 2 not more than 0.5 More than 0.5 and — At least 3 not more than 0.8 More than 0.8 and At least 135 At least 120 At least 4 At least 0.2 and The same as not more than 1.3 not more than 2.9 the thickness More than 1.3 and Not more than At least 120 At least 5 More than 2.9 and 1.5 times not more than 2.9 175 not more than 6 the thickness More than 2.9 and At least 120 At least 6 not more than 4 More than 4 and not At least 120 At least 7 more than 6.5 More than 6.5 and At least 120 At least 8 not more than 12 H16 At least 0.2 and not — At least 1 H26 more than 0.5 More than 0.5 and At least 165 — At least 2 At least 0.2 and 2 times not more than 0.8 not more than 1.3 the thickness More than 0.8 and Not more than At least 145 At least 3 More than 1.3 and 2.5 times not more than 1.3 205 not more than 2.9 the thickness More than 1.3 and At least 145 At least 4 More than 2.9 and 3 times not more than 4 not more than 4 the thickness H18 At least 0.2 and not — At least 1 more than 0.5 More than 0.5 and — At least 2 not more than 0.8 More than 0.8 and Not more than At least 165 At least 3 — — not more than 1.3 185 More than 1.3 and At least 165 At least 4 not more than 3 A 6061P T6 At least 0.4 and 1.5 times not more than 0.5 the thickness At least 0.4 and not At least 295 — At least 8 More than 0.5 and 2 times more than 0.5 not more than 1.6 the thickness More than 0.5 and At least 245 At least 10 More than 1.6 and 2.5 times not more than 6.5 not more than 2.9 the thickness More than 2.9 and 3 times not more than 6 the thickness - Further, the C1020-H is obtained by work hardening the oxygen-free copper (C1020) shown in Table 7 below. The mechanical properties of the C1020-H are as shown in Table 8 below. The alphabet “P” shown in the column of DESIGNATION of Table 8 after the C1020 is a symbol indicating that a test piece has a plate shape.
-
TABLE 7 CHEMICAL COMPOSITIONS ALLOY CHEMICAL COMPOSITION No. Cu Pb Fe Sn Zn Al Mn Ni P OTHERS C 1020 At least 99.96 — — — — — — — — — UNIT: % -
TABLE 8 MECHANICAL PROPERTIES HARDNESS TEST TENSILE TEST BENDING TEST VICKERS THICK- TENSIL ELON- THICK- THICK- HARD- ALLOY DESIG- NESS STRENGTH GATION NESS BENDING INSIDE NESS NESS No. TEMPER NATION mm N/mm2 % mm ANGLE RADIUS mm HV C 1020 H C 1020 P-H At least 0.15 and At least 275 — Not more 180° 1.5 times At least 0.3 At least 80 less than 0.3 than 2 the thick- At least 0.3 and ness not more than 10 - Further, in the above-described embodiments, examples of the insert part (the second swaged
parts insert part 112 b, and the first swagedpart 312 b) having a circular shape is described. However, the insert part may have a non-circular shape. For example, the insert-receiving part may have an elliptical shape or oblong shape. With such a configuration, when the distal end of the insert part is swaged while the rivet member is supported by any means such as a tool and jig, the motion of the conductive member to rotate about the center axis due to the swaging action force on the distal end of the conductive member is restricted. Thus, when the distal end of the insert part of the rivet member is swaged, the relative rotation between the rivet member and the conductive member can be suppressed. - Further, in the above-described embodiments, examples in which the insert-receiving part is a hole are described. However, the insert-receiving part may be a recess formed by recessing the edge of the conductive member in the width direction as long as the insert part can be inserted therein.
- Further, the electrode assembly is not limited to the elongated cylindrical electrode assembly of wound type as described in the above-described embodiments, and may have another shape. For example, the electrode assembly may be of stacked type in which a plurality of
negative electrode sheets 5 and a plurality ofpositive electrode sheets 6 are alternately stacked via separators 7. - Further, in the above-described embodiments, examples in which the
terminal structures cover plates case body 2. That is, the rivet member may pass through thecase body 2. Thecase body 2 may be formed using a metal material other than aluminum alloy. - Further, a lithium ion secondary battery cell has been described in the above-described embodiments. However, the type and size (capacity) of battery cells are arbitrarily selected.
- Further, the present invention is not limited to the lithium ion secondary battery cells. For example, the present invention can be applied also to primary battery cells and capacitors such as an electric double layer capacitor in addition to various secondary battery cells.
-
-
- 1: Case
- 2: Case Body
- 3: Cover Plate
- 3 a: Through Hole
- 3 b: Recess
- 4: Electrode Assembly
- 5: Negative Electrode Sheet
- 6: Positive Electrode Sheet
- 7: Separator
- 8: Current Collector
- 8 a: Connector
- 8 b: Through Hole
- 9: Terminal Structure
- 10: Resin Plate
- 10 a: Recess
- 10 b: Through Hole
- 11: Outer Gasket
- 11 a: Outer Wall
- 11 b: Recess
- 11 c: Through Hole
- 11 d: Annular Projection
- 12: Rivet Member (Conductive Member)
- 12 a: Body Part
- 12 b: First Swaged Part
- 12 c: Second Swaged Part (Insertion Part)
- 12 d: Non-Through Hole
- 12 e: Bottom
- 13: Terminal Anti-Rotation Member
- 14: Terminal Bolt
- 15: Pulling Member
- 15 a: First Through Hole (Insert-Receiving Part)
- 15 b: Second Through Hole
- 109: Terminal Structure
- 110: Resin Plate
- 111: Outer Gasket
- 112: Rivet Member
- 112 a: Body Part
- 112 b: Insert Part
- 115: Pulling Member (Conductive Member)
- 115 a: First Through Hole
- 203: Cover Plate
- 203 b: Recess
- 209: Terminal Structure
- 211: Outer Gasket
- 211 a: Outer Wall
- 211 b: Recess
- 211 c: Through Hole
- 211 d: Annular Projection
- 212: Rivet Member
- 212 a: Body Part
- 212 b: First Swaged Part
- 212 c: Second Swaged Part (Insertion Part)
- 212 d: Non-Through Hole
- 212 e: Bottom
- 213: External Terminal (Conductive Member)
- 213 a: Conductor Connection Part
- 213 b: Through Hole (Insert-Receiving Part)
- 214: Bus Bar
- 214 a: Coupling Member
- 214 b: Insertion Hole
- 309: Terminal Structure
- 312: Rivet Member
- 312 a: Body Part
- 312 b: First Swaged Part (Insertion Part)
- 409: Terminal Structure
- 415: Pulling Member (Conductive Member)
- 415 a: First Through Hole
- 415 b: First Perforated Portion
- 415 c: Second Perforated Portion
- 512: Rivet Member
- 512 a: Body Part
- 512 c: Second Swaged Part
- 515: Pulling Member
Claims (13)
1. An electric storage device comprising:
an electrode assembly comprising a positive electrode plate and a negative electrode plate that are insulated from each other;
a case constituted by a partition wall, the case housing the electrode assembly;
a rivet member comprising an insert part on one end, the rivet member being fixed to the partition wall; and
a conductive member comprising an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein
the insert part has a higher Vickers hardness than a peripheral region of the insert-receiving part of the conductive member, and
the insert part comprises, at a distal end of the insert part, a swaged part that is swaged while the insert part is inserted through the conductive member.
2. The electric storage device according to claim 1 , wherein
the rivet member comprises a body part that is joined to the insert part and is in contact with the conductive member,
the body part has a larger width dimension in a direction intersecting the insertion direction of the insert part than the insert-receiving part, and
the body part has a higher Vickers hardness than a region of the conductive member in contact with the body part.
3. The electric storage device according to claim 2 , wherein
the body part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
4. The electric storage device according to claim 1 , wherein
the insert part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
5. An electric storage device comprising:
an electrode assembly comprising a positive electrode plate and a negative electrode plate that are insulated from each other;
a case constituted by a partition wall, the case housing the electrode assembly;
a rivet member comprising an insert part provided on one end and a body part joined to the insert part, the rivet member being fixed to the partition wall; and
a conductive member comprising an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein
the body part has a larger width in a direction intersecting the insertion direction of the insert part than the insert-receiving part and is in contact with the conductive member,
the body part has a higher Vickers hardness than a region of the conductive member in contact with the body part, and
the insert part comprises, at a distal end of the insert part, a swaged part that is swaged while the insert part is inserted through the conductive member.
6. The electric storage device according to claim 5 , wherein
the body part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
7. An electric storage device comprising:
an electrode assembly comprising a positive electrode plate and a negative electrode plate that are insulated from each other;
a case constituted by a partition wall, the case housing the electrode assembly;
a rivet member comprising an insert part on one end, the rivet member being fixed to the partition wall; and
a conductive member comprising an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein
the insert part has any one of materials C1100-H, C1020-H, and A6061-T6 that are defined in Japanese Industrial Standards,
the insert-receiving part of the conductive member has any one of materials A5052-H34, A1050-H24, A1100-O, A1100-H24, and A3003-H, and annealed material C1100-H that are defined in Japanese Industrial Standards, and
the insert part comprises, at a distal end of the insert part, a swaged part that is swaged while the insert part is inserted through the conductive member.
8. The electric storage device according to claim 7 , wherein
the rivet member comprises a body part having a larger width dimension in a direction intersecting the insertion direction of the insert part than the insert-receiving part, the body part being in contact with the conductive member, and
the body part has any one of materials C1100-H, C1020-H, and A6061-T6 that are defined in Japanese Industrial Standards.
9. The electric storage device according to claim 8 , wherein
the body part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
10. The electric storage device according to claim 7 , wherein
the insert part has a non-circular shape as seen in the center axis direction of the insert-receiving part.
11. An electric storage device comprising:
an electrode assembly comprising a positive electrode plate and a negative electrode plate that are insulated from each other;
a case constituted by a partition wall, the case housing the electrode assembly;
a rivet member comprising an insert part on one end, the rivet member being fixed to the partition wall; and
a conductive member comprising an insert-receiving part through which the insert part is inserted, the conductive member being electrically connected to the rivet member, wherein
the rivet member comprises:
a body part having a larger width dimension in a direction intersecting the insertion direction of the insert part than the insert-receiving part, the body part being in contact with the conductive member; and
a swaged part formed by the distal end of the insert part being swaged while the distal end of the insert part is inserted through the conductive member, the swaged part having a larger width dimension in a direction intersecting the insertion direction of the insert part than the insert-receiving part and sandwiching the conductive member with the body part,
the conductive member has a first recess into which at least a part of the swaged part is fitted and a second recess into which a portion of the body part that is in contact with the conductive member is fitted, and
the first recess and the second recess are recessed in the insertion direction of the insert part so as to be closer to each other.
12. An electric storage apparatus comprising:
at least two electric storage devices including at least one electric storage device set forth in claim 1 ; and
a bus bar coupling the at least two electric storage devices to each other.
13. The electric storage apparatus according to claim 12 , wherein
the bus bar is stacked on the conductive member, and the bus bar has an insertion hole larger than the swaged part in a region overlapping the swaged part.
Applications Claiming Priority (3)
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JP2013-065120 | 2013-03-26 | ||
JP2013065120 | 2013-03-26 | ||
PCT/JP2014/058258 WO2014157191A1 (en) | 2013-03-26 | 2014-03-25 | Electricity storage element, and electricity storage device equipped with electricity storage element |
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US20160043353A1 true US20160043353A1 (en) | 2016-02-11 |
US10193107B2 US10193107B2 (en) | 2019-01-29 |
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US14/777,460 Active 2034-05-14 US10193107B2 (en) | 2013-03-26 | 2014-03-25 | Electric storage device and electric storage apparatus provided with the electric storage device |
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US (1) | US10193107B2 (en) |
JP (1) | JP6216368B2 (en) |
CN (1) | CN105144432A (en) |
DE (1) | DE112014001644T5 (en) |
WO (1) | WO2014157191A1 (en) |
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US20220352588A1 (en) * | 2021-04-30 | 2022-11-03 | Caterpillar Inc. | Housing for securing battery cells in a battery module |
Also Published As
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US10193107B2 (en) | 2019-01-29 |
CN105144432A (en) | 2015-12-09 |
JP6216368B2 (en) | 2017-10-18 |
DE112014001644T5 (en) | 2016-05-04 |
WO2014157191A1 (en) | 2014-10-02 |
JPWO2014157191A1 (en) | 2017-02-16 |
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